EP2138217B1 - Wash filter with wash velocity control cone - Google Patents
Wash filter with wash velocity control cone Download PDFInfo
- Publication number
- EP2138217B1 EP2138217B1 EP09251020.5A EP09251020A EP2138217B1 EP 2138217 B1 EP2138217 B1 EP 2138217B1 EP 09251020 A EP09251020 A EP 09251020A EP 2138217 B1 EP2138217 B1 EP 2138217B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wash
- flow
- velocity control
- control cone
- cone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000446 fuel Substances 0.000 claims description 24
- 230000004913 activation Effects 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 230000003068 static effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 3
- 238000011109 contamination Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/23—Supported filter elements arranged for outward flow filtration
- B01D29/25—Supported filter elements arranged for outward flow filtration open-ended the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/117—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration
- B01D29/118—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements arranged for outward flow filtration open-ended
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
- B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
- B01D29/904—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding directing the mixture to be filtered on the filtering element in a manner to clean the filter continuously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/38—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements with regeneration means
Definitions
- the present invention relates to a filtering system and more particularly to a wash filter therefor.
- Engine systems often contain contamination sensitive components. These components are sensitive to contamination and require a filtration system which protects the clearances against contamination within the fuel.
- Pumps that supply pressure and flow are typically fixed displacement pumps - that is, the flow varies linearly with speed. During steady-state operation, excess pump flow is bypassed and recirculated. Conventional fixed geometry wash filters utilize this excess flow as wash flow. The range of wash flow over the pump operating envelope supplies sufficient washing action to clean a traditional wash filter filtration system.
- variable wash flow filter assembly comprising: a housing which defines an inlet along a longitudinal axis, at least one filtered flow port, and at least one thru flow port; a wash filter within said housing adjacent to said at least one filtered flow port; a wash velocity control cone biased within said housing by a bias member positioned in an internal space in the cone, said wash velocity control cone being movable between a minimal position and a maximum position relative to said wash filter with a conical gap between the wash velocity cone and the wash filter, the wash flow filter assembly arranged to split a fuel flow through said inlet between a burn flow through said thru flow port and a filtered flow through said filter of flow port; and a guide with a spring seat to react said bias member, said guide being operable to guide said wash velocity control cone along said longitudinal axis between said minimal and said maximum position.
- the present invention is characterised by the guide having a sleeve section which extends around the outside of the wash velocity control cone; and at least one activation deltaP window, which is located through the sleeve section downstream of the conical gap and which in part, controls movement of the wash velocity cone by avoiding the potential closing force caused by relatively high velocity fluid which results in a drop in static pressure, wherein when the wash velocity control cone is in the minimal position the activation deltaP window is open to provide a path between the at least one thru flow port and the internal space of the wash velocity control cone and a path between the conical gap and the internal space of the wash velocity control cone, and wherein when the wash velocity control cone is in the maximum position the activation deltaP window is closed to shut the path between the at least one thru flow port and the internal space of the wash velocity control cone
- the present invention also provides a method of filtering a fuel flow comprising: biasing a wash velocity control cone relative to a wash filter within a variable wash flow filter assembly by a bias member positioned in an internal space in the cone, the wash velocity control cone being movable between a minimal position and a maximum position and guided by a guide along a longitudinal axis, the variable wash flow filter assembly splitting a fuel flow into a burn flow through a thru flow port and a filtered flow through a filtered flow port, the burn flow being operable as a wash flow to carry away contaminate trapped by the wash filter within said variable wash flow filter assembly; and characterised by controlling, inpart, movement of the wash velocity cone by at least one activation deltaP window located downstream of a conical gap between said wash velocity control cone and said wash filter; wherein the activation deltaP window is located through a sleeve section of the guide which extends around the outside of the wash velocity control cone and avoids a potential closing force caused by relatively high velocity fluid which results in a drop in static pressure
- FIG 1 illustrates a schematic of a fuel system 50 that utilizes a variable wash flow filter assembly 54.
- the fuel system 50 generally includes a main fuel pump 52 which communicates a fuel flow F from an outlet thereof through a variable wash flow filter assembly 54.
- the fuel flow F from the variable wash flow filter assembly 54 is split between a burn flow GG and a filtered flow FF.
- the filtered flow FF and/or the burn flow GG may exit the variable wash flow filter assembly 54 in a radial ( Figure 2A ) flow path.
- the filtered flow FF is communicated to a multiple of contaminate sensitive components 56.
- the variable wash flow filter assembly 54 may be used in systems other than gas turbine engines.
- the burn flow GG is thereby utilized as the wash flow, however, the burn flow GG may have a relatively high "turn down ratio" or the ratio of max flow to min flow. This high turn down ratio would not allow a conventional fixed geometry wash filter to meet a standard wash velocity range for a fixed geometry wash filter.
- the variable wash flow filter assembly 54 maintains the wash velocity within a desired range for effective operation.
- variable wash flow filter assembly 54 includes a housing 60 which defines an inlet 62, at least one filtered flow FF port 64, and at least one thru flow GG port 66 (also illustrated in Figure 2D ).
- a wash velocity control cone 68 is biased within the housing 60 with a bias member 70 such as a spring to move between a minimal position ( Figure 2B ) and a maximum position ( Figure 2C ).
- the bias member 70 reacts against a spring seat 72 mounted to a guide 76.
- the guide 76 guides the wash velocity control cone 68 for axial movement along an axis A of the variable wash flow filter assembly 54.
- the wash filter 74 is of conical shape to receive the wash velocity control cone 68 which has a generally equivalent shape such that, at the minimum position ( Figure 2B ), a small gap is maintained between the wash velocity control cone 68 and the wash filter 74.
- This controlled minimum gap corresponds to a low flow condition in which the minimum gap provides sufficient wash velocity to carry away contaminate trapped by the wash filter 74.
- movement of the wash velocity control cone 68 will increase the gap between the wash velocity control cone 68 and the wash filter 74 in proportion to the flow from the fuel pump in response to, for example, an increase in either demand flow or filtered flow.
- This movement and the variable gap maintain a relatively constant wash velocity to assure that contaminate trapped by the wash filter 74 will be carried away with the demand flow GG.
- the gap between the wash velocity control cone 68 and the wash filter 74 has a relatively high fluid velocity which may causes a drop in the static fluid pressure that may result in a closing pressure load and a net closing force on the wash velocity control cone 68.
- at least one activation deltaP window 78 is located within the guide 76 downstream of the conical gap between the wash velocity control cone 68 and the wash filter 74.
- the window 78 is located through a sleeve section of the guide 76.
- One or more windows 78 may be located and contoured to optimize the deltaP for various flow conditions which provide net positive forces for controlling cone position.
- the fuel is guided to flow between the wash velocity control cone 68 and the wash filter 74. Movement of the wash velocity control cone 68 relative the wash filter 74 operates to vary the flow area relative to the stroke of the wash velocity control cone 68. A portion of the inlet flow will pass through the wash filter 74 and into the filtered flow FF port 64 to become filtered flow FF.
- the balance of the fuel becomes system demand flow and will carry away contaminate trapped by the wash filter 74.
- System demand flow passes essentially though the variable wash flow filter assembly 54, while the filtered flow FF is directed generally perpendicular to the axis F through the wash filter assembly 54.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filtration Of Liquid (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
- The present invention relates to a filtering system and more particularly to a wash filter therefor.
- Engine systems often contain contamination sensitive components. These components are sensitive to contamination and require a filtration system which protects the clearances against contamination within the fuel.
- Pumps that supply pressure and flow are typically fixed displacement pumps - that is, the flow varies linearly with speed. During steady-state operation, excess pump flow is bypassed and recirculated. Conventional fixed geometry wash filters utilize this excess flow as wash flow. The range of wash flow over the pump operating envelope supplies sufficient washing action to clean a traditional wash filter filtration system.
- It is known from
WO 2008/063869 to provide a variable wash flow filter assembly comprising: a housing which defines an inlet along a longitudinal axis, at least one filtered flow port, and at least one thru flow port; a wash filter within said housing adjacent to said at least one filtered flow port; a wash velocity control cone biased within said housing by a bias member positioned in an internal space in the cone, said wash velocity control cone being movable between a minimal position and a maximum position relative to said wash filter with a conical gap between the wash velocity cone and the wash filter, the wash flow filter assembly arranged to split a fuel flow through said inlet between a burn flow through said thru flow port and a filtered flow through said filter of flow port; and a guide with a spring seat to react said bias member, said guide being operable to guide said wash velocity control cone along said longitudinal axis between said minimal and said maximum position. - The present invention is characterised by the guide having a sleeve section which extends around the outside of the wash velocity control cone; and at least one activation deltaP window, which is located through the sleeve section downstream of the conical gap and which in part, controls movement of the wash velocity cone by avoiding the potential closing force caused by relatively high velocity fluid which results in a drop in static pressure, wherein when the wash velocity control cone is in the minimal position the activation deltaP window is open to provide a path between the at least one thru flow port and the internal space of the wash velocity control cone and a path between the conical gap and the internal space of the wash velocity control cone, and wherein when the wash velocity control cone is in the maximum position the activation deltaP window is closed to shut the path between the at least one thru flow port and the internal space of the wash velocity control cone
- The present invention also provides a method of filtering a fuel flow comprising: biasing a wash velocity control cone relative to a wash filter within a variable wash flow filter assembly by a bias member positioned in an internal space in the cone, the wash velocity control cone being movable between a minimal position and a maximum position and guided by a guide along a longitudinal axis, the variable wash flow filter assembly splitting a fuel flow into a burn flow through a thru flow port and a filtered flow through a filtered flow port, the burn flow being operable as a wash flow to carry away contaminate trapped by the wash filter within said variable wash flow filter assembly; and characterised by controlling, inpart, movement of the wash velocity cone by at least one activation deltaP window located downstream of a conical gap between said wash velocity control cone and said wash filter; wherein the activation deltaP window is located through a sleeve section of the guide which extends around the outside of the wash velocity control cone and avoids a potential closing force caused by relatively high velocity fluid which results in a drop in static pressure, wherein when the wash velocity control cone is in the minimal position the activation deltaP window is open to provide a path between the at least one thru flow port and the internal space of the wash velocity control cone and a path between the conical gap and the internal space of the wash velocity control cone, and wherein when the wash velocity control cone is in the maximum position the activation deltaP window is closed to shut the path between the at least one thru flow port and the internal space of the wash velocity control cone.
- The various features and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the disclosed non-limiting embodiment. The drawings that accompany the detailed description can be briefly described as follows:
-
Figure 1 is a schematic view of a fuel system; -
Figure 2A is a perspective cross sectional view of a variable wash flow filter assembly; -
Figure 2B is a cross sectional view of the variable wash flow filter assembly, with radial exit, ofFigure 2A in a first position; -
Figure 2C is a cross sectional view of the variable wash flow filter assembly, with radial exit, ofFigure 2A in a second position; -
Figure 2D is an exploded view of the components in the variable wash flow filter assembly, with radial exit, ofFigure 2A . -
Figure 1 illustrates a schematic of afuel system 50 that utilizes a variable washflow filter assembly 54. Thefuel system 50 generally includes amain fuel pump 52 which communicates a fuel flow F from an outlet thereof through a variable washflow filter assembly 54. The fuel flow F from the variable washflow filter assembly 54 is split between a burn flow GG and a filtered flow FF. The filtered flow FF and/or the burn flow GG may exit the variable washflow filter assembly 54 in a radial (Figure 2A ) flow path. The filtered flow FF is communicated to a multiple of contaminatesensitive components 56. Furthermore, it should be understood that the variable washflow filter assembly 54 may be used in systems other than gas turbine engines. - As the filtered flow FF supplies only the flow required for contaminate
sensitive devices 56, there is no excess flow to supply wash flow within the variable washflow filter assembly 54. The burn flow GG is thereby utilized as the wash flow, however, the burn flow GG may have a relatively high "turn down ratio" or the ratio of max flow to min flow. This high turn down ratio would not allow a conventional fixed geometry wash filter to meet a standard wash velocity range for a fixed geometry wash filter. The variable washflow filter assembly 54 maintains the wash velocity within a desired range for effective operation. - Referring to
Figure 2A , the variable washflow filter assembly 54 includes ahousing 60 which defines aninlet 62, at least one filteredflow FF port 64, and at least one thru flow GG port 66 (also illustrated inFigure 2D ). A washvelocity control cone 68 is biased within thehousing 60 with abias member 70 such as a spring to move between a minimal position (Figure 2B ) and a maximum position (Figure 2C ). Thebias member 70 reacts against aspring seat 72 mounted to aguide 76. Theguide 76 guides the washvelocity control cone 68 for axial movement along an axis A of the variable washflow filter assembly 54. - The
wash filter 74 is of conical shape to receive the washvelocity control cone 68 which has a generally equivalent shape such that, at the minimum position (Figure 2B ), a small gap is maintained between the washvelocity control cone 68 and thewash filter 74. This controlled minimum gap corresponds to a low flow condition in which the minimum gap provides sufficient wash velocity to carry away contaminate trapped by thewash filter 74. As flow from thefuel pump 52 increases, pressure drop and flow momentum forces on the washvelocity control cone 68 change. The washvelocity control cone 68 strokes against thebias member 70 to settle at a position where the flow and pressure forces are in balance. In this manner, movement of the washvelocity control cone 68 will increase the gap between the washvelocity control cone 68 and thewash filter 74 in proportion to the flow from the fuel pump in response to, for example, an increase in either demand flow or filtered flow. This movement and the variable gap maintain a relatively constant wash velocity to assure that contaminate trapped by thewash filter 74 will be carried away with the demand flow GG. - The gap between the wash
velocity control cone 68 and thewash filter 74 has a relatively high fluid velocity which may causes a drop in the static fluid pressure that may result in a closing pressure load and a net closing force on the washvelocity control cone 68. To avoid this potential closing force, at least oneactivation deltaP window 78 is located within theguide 76 downstream of the conical gap between the washvelocity control cone 68 and thewash filter 74. Thewindow 78 is located through a sleeve section of theguide 76. One ormore windows 78 may be located and contoured to optimize the deltaP for various flow conditions which provide net positive forces for controlling cone position. - Fuel flow F from the
main fuel pump 52 enters the variable washflow filter assembly 54 through theinlet 62. The fuel is guided to flow between the washvelocity control cone 68 and thewash filter 74. Movement of the washvelocity control cone 68 relative thewash filter 74 operates to vary the flow area relative to the stroke of the washvelocity control cone 68. A portion of the inlet flow will pass through thewash filter 74 and into the filteredflow FF port 64 to become filtered flow FF. The balance of the fuel becomes system demand flow and will carry away contaminate trapped by thewash filter 74. System demand flow passes essentially though the variable washflow filter assembly 54, while the filtered flow FF is directed generally perpendicular to the axis F through thewash filter assembly 54. - It should be understood that relative positional terms such as "forward," "aft," "upper," "lower," "above," "below," and the like are with reference to the normal operational attitude of the vehicle and should not be considered otherwise limiting.
- It should be understood that although a particular component arrangement is disclosed in the illustrated embodiment, other arrangements will benefit from the instant invention.
- Although particular step sequences are shown, described, and claimed, it should be understood that steps may be performed in any order, separated or combined unless otherwise indicated and will still benefit from the present invention.
- The foregoing description is exemplary rather than defined by the limitations within. Many modifications and variations are possible in light of the above teachings. Non-limiting embodiments are disclosed herein, however, one of ordinary skill in the art would recognize that certain modifications would come within the scope of this invention. It is, therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described. For that reason the following claims should be studied to determine the true scope and content of this invention.
Claims (9)
- A variable wash flow filter assembly (54) comprising:a housing (60) which defines an inlet (62) along a longitudinal axis (A), at least one filtered flow port (64), and at least one thru flow port (66);a wash filter (74) within said housing adjacent to said at least one filtered flow port;a wash velocity control cone (68) biased within said housing by a bias member positioned in an internal space in the cone (68), said wash velocity control cone being movable between a minimal position and a maximum position relative to said wash filter with a conical gap between the wash velocity cone and the wash filter, the variable wash flow filter assembly arranged to split a fuel flow through said inlet between a burn flow through said thru flow port and a filtered flow through said filtered flow port; anda guide (76) with a spring seat to react said bias member, said guide being operable to guide said wash velocity control cone along said longitudinal axis between said minimal and said maximum position; characterised by:the guide having a sleeve section which extends around the outside of the wash velocity control cone (68); andat least one activation deltaP window (78), which is located through the sleeve section downstream of the conical gap and which in part, controls movement of the wash velocity cone by avoiding the potential closing force caused by relatively high velocity fluid which results in a drop in static pressure,wherein when the wash velocity control cone (68) is in the minimal position the activation deltaP window (78) is open to provide a path between the at least one thru flow port (66) and the internal space of the wash velocity control cone (68) and a path between the conical gap and the internal space of the wash velocity control cone, and wherein when the wash velocity control cone (68) is in the maximum position the activation deltaP window (78) is closed to shut the path between the at least one thru flow port (66) and the internal space of the wash velocity control cone (68).
- The variable wash flow filter assembly as recited in claim 1, wherein said wash filter (74) is conical in shape.
- The variable wash flow filter assembly as recited in claim 1 or 2, wherein said wash velocity control cone (68) is conical in shape.
- The variable wash flow filter assembly as recited in claim 1, 2, or 3, wherein said at least one thru flow port (66") is located upon a longitudinal axis (A) of said housing.
- A fuel system (50) comprising:a main fuel pump (52); anda variable wash flow filter assembly (54), as recited in any preceding claim, in fluid communication with said main fuel pump.
- The system as recited in claim 5, wherein said variable wash flow filter assembly (54) is mounted to an outlet of said main fuel pump.
- The system as recited in claim 6, wherein:the housing (60) which defines an inlet (62) is in communication with said outlet from said main fuel pump.
- A method of filtering a fuel flow comprising:providing a variable wash flow filter assembly (54) as recited in any one of claims 1-4,
wherein when the wash velocity control cone (68) is in the minimal position the activation deltaP window (78) is open to provide a path between the at least one thru flow port (66) and the internal space of the wash velocity control cone (68) and a path between the conical gap and the internal space of the wash velocity control cone, and wherein when the wash velocity control cone (68) is in the maximum position the activation deltaP window (78) is closed to shut the path between the at least one thru flow port (66) and the internal space of the wash velocity control cone - A method as recited in claim 8, further comprising: mounting the variable wash flow filter assembly (54) to an outlet of a fuel pump (52).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/146,562 US8029664B2 (en) | 2008-06-26 | 2008-06-26 | Wash filter with wash velocity control cone |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2138217A1 EP2138217A1 (en) | 2009-12-30 |
EP2138217B1 true EP2138217B1 (en) | 2016-03-30 |
Family
ID=40671101
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP09251020.5A Active EP2138217B1 (en) | 2008-06-26 | 2009-03-31 | Wash filter with wash velocity control cone |
Country Status (3)
Country | Link |
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US (2) | US8029664B2 (en) |
EP (1) | EP2138217B1 (en) |
JP (1) | JP2010007661A (en) |
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EP2910752B1 (en) * | 2014-02-19 | 2018-04-25 | United Technologies Corporation | Fuel manifold fitting with integral support for a gas turbine engine and method of mounting a fuel supply manifold assembly |
WO2016170178A1 (en) * | 2015-04-24 | 2016-10-27 | Tetra Laval Holdings & Finance S.A. | A filter unit, and a processing equipment comprising such filter unit |
CN109078374B (en) * | 2018-08-28 | 2020-08-11 | 中国农业科学院农田灌溉研究所 | Method for realizing self-cleaning of drip irrigation filter |
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US20090321334A1 (en) | 2009-12-31 |
JP2010007661A (en) | 2010-01-14 |
US8029664B2 (en) | 2011-10-04 |
US8313656B2 (en) | 2012-11-20 |
EP2138217A1 (en) | 2009-12-30 |
US20120000844A1 (en) | 2012-01-05 |
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